Here at procooling, we love to split hairs about stuff that in the real world is mostly meaningless
. I have to agree with Althornin though, heatercores are not intended to cool anything really, their purpose is to get hot and stay hot via the car's coolant for our comfort known as heat (inside the car). They are just a constant heat source and nothing more. The reason (again agreeing with Althornin) they are so common for our app is primarily because they are cheap and are made of copper/brass and come in the right sizes for our needs. They are generally not too restrictive either, their one big drawback is that they are so damn thick.